(MMF) Mycophenolate mofetil DOSAGE AND ADMINISTRATION: Dosing of MMF will continue at the highest tolerated dose the subject was taking at the completion of the parent study: "Highly Sensitized Patients: effects of mycophenolate mofetil (MMF) on anti- human lymphocyte antibody (HLA) levels in patients awaiting renal transplant". The dose will be adjusted according to standard practices, gastrointestinal tolerance and WBC count.